Keegan joined St Patrick's Athletic from schoolboy football team Crumlin United,[2] where he broke the scoring record for the club with 33 goals in 29 games in 2001.
[citation needed] In 1992, after his first year with Pat's and Brian Kerr's successful side, Keegan accepted the offer of a soccer scholarship by Boston College where he learned his trade under the tutelage of renowned coach Ed Kelly.
[5][4] Keegan played in 27 total league matches, making 20 starts, in the Revolution's inaugural campaign, scoring four goals and adding three assists.
[4] In 1997, Keegan provided the 88th-minute deciding goal as the Revolution took a 2-1 win over the Dallas Burn at the Cotton Bowl on the final day of the 1997 season, clinching the team’s first playoff berth.
The following year he returned home to Ireland and joined Bray Wanderers[7] and his performances there earned a move to title chasing Bohemians in 2002.